linux-kernel - Re: [PATCHSET] percpu: generalize first chunk allocators and improve lpage NUMA support

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Message-ID: <4A43871F.9030507@zytor.com>
Date:	Thu, 25 Jun 2009 07:18:07 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Andi Kleen <andi@...stfloor.org>
CC:	Andrew Morton <akpm@...ux-foundation.org>,
	Tejun Heo <tj@...nel.org>, linux-kernel@...r.kernel.org,
	x86@...nel.org, linux-arch@...r.kernel.org, mingo@...e.hu,
	tglx@...utronix.de, cl@...ux-foundation.org
Subject: Re: [PATCHSET] percpu: generalize first chunk allocators and improve
 lpage NUMA support

Andi Kleen wrote:
>>>
>> *Ahem* virtual machines *ahem*...
> 
> And? Even there's not that big typically. 
> 
> The traditional problem was just for 128 NR_CPUs kernel were nothing
> was sized based on machine capacity.
> 
> Also on large systems the VMs shouldn't be sized for full capacity.
> 

We have already have cases where the "possible" CPUs have eaten up the
entire vmalloc area on 32 bits.  In real use.  It's a real problem.

	-hpa

-- 
H. Peter Anvin, Intel Open Source Technology Center
I work for Intel.  I don't speak on their behalf.

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